Compositions for recording materials

Abstract

A composition for a recording material comprising a bismuth-sulfur series material or a bismuth-germanium-sulfur series material.

What is claimed is: 
     
       1. A composition for making a lithographic printing plate capable of recording by imagewise exposure to light which contains a bismuth-germanium-sulfur series material containing at least 40 atomic % sulfur. 
     
     
       2. A composition for a recording material capable of recording by imagewise exposure to light, which includes as mandatory components Bi, Ge and S and which is represented by the following general formula:   Bi.sub.X Ge.sub.Y S.sub.Z M.sub.A     wherein X+Y+Z=100, X is less than 60 atomic %, Z is more than 40 atomic % and balance is Y to make 100 atomic %, A≦10, and M represents at least one element selected from the group consisting of selenium, tellurium, oxygen, phosphorus, sodium, potassium, silicon, tin, lead, zinc, iodine, copper, silver, gallium, indium, thallium, arsenic and antimony.   
     
     
       3. A composition as claimed in claim 2, which falls within the area bounded by the curve joining the points A, B, C, D, E and A in the FIGURE of the accompanying drawing or which lies on the curve joining the points D, E, A and B and which does not lie on the straight line joining the points B, C and D. 
     
     
       4. A composition as claimed in claim 2, which falls within the area bounded by the curve joining the points C, D, E and C in the FIGURE of the accompanying drawing or which lies on the curve joining the points D, E, and C and which does not lie on the straight line joining the points C and D. 
     
     
       5. A light-sensitive recording element for making a lithographic printing plate comprising a support having a layer thereon of the composition of claim 1. 
     
     
       6. A light-sensitive recording element comprising a support having a layer thereon of the composition of claim 2. 
     
     
       7. A process for forming a lithographic printing plate comprising image-wise exposing to light the light-sensitive recording element of claim 5, whereby an ink-repellant and an ink-receptive differentiation is produced between the exposed areas and the unexposed areas of said recording element. 
     
     
       8. The process of claim 7, further comprising the steps of applying a printing ink to the imagewise-exposed surface and transferring the ink by bringing said surface into contact with a second surface. 
     
     
       9. The light-sensitive recording element of claim 5, wherein the film thickness of said layer is about 25 A to about 1,000μ. 
     
     
       10. The light-sensitive recording element of claim 9, wherein said thickness is about 100 A to about 3,000 A. 
     
     
       11. The light-sensitive recording element of claim 6, wherein the film thickness of said layer is about 25 A to about 1,000μ. 
     
     
       12. The light-sensitive recording element of claim 11, wherein said thickness is about 100 A to about 3,000 A.